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SECURITIES - Investment Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months $ 59,820 $ 123,007
12 months or longer 180,904 131,436
Total 240,724 254,443
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months 1,237 1,199
12 months or longer 10,125 4,171
Total 11,362 5,370
Obligations of U.S. Government and U.S. Government sponsored enterprises    
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months 9,953 14,982
12 months or longer 0 0
Total 9,953 14,982
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months 42 21
12 months or longer 0 0
Total 42 21
Mortgage-backed securities, residential    
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months 11,248 83,562
12 months or longer 173,420 131,165
Total 184,668 214,727
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months 448 1,013
12 months or longer 9,810 4,153
Total 10,258 5,166
Obligations of states and political subdivisions    
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months 38,405 20,526
12 months or longer 4,250 271
Total 42,655 20,797
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months 746 133
12 months or longer 270 18
Total 1,016 151
SBA loan pools    
Available-for-sale securities in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 months 214 3,937
12 months or longer 3,234 0
Total 3,448 3,937
Available-for-sale securities in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 months 1 32
12 months or longer 45 0
Total $ 46 $ 32